User manual HP STORAGEWORKS SECURE MANAGER TAPE LIBRARY SOFTWARE COMMAND VIEW ESL/SECURE MANAGER MAPPING ALGORITHMS

[. . . ] Command View ESL/Secure Manager Mapping Algorithms Updated: January 2005 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Abbreviations, Acronyms, and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Mapping Requirements Lead to Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] NEW LUN 0 1 2 FC Port 0 Robotics Drive 2 MODIFIED LUN 0 1 2 FC Port 0 Robotics Drive 2 4. If there is more than one FC port on a FC interface controller, load balancing algorithms are used Tape devices attached to a particular FC interface controller are sorted in ascending order by logical position in the library. The first two tape devices are assigned to the first FC port at the next available LUNs. The next two tape devices are assigned to the second FC port at the next available LUNs. If there are more than two tape devices per FC port then the following tape devices are assigned in a similar fashion starting over at the first FC port. Secure Manager takes the following steps when load balancing target devices across FC ports on a dual port FC interface controller (such as an e2400-160): 1. If the robotics controller is attached to the FC interface controller, it is mapped to FC port 0 at LUN 0. 7 Table 3. Load Balancing with Robotics and 4 Tape Drives on a 2 FC Port FC interface controller LUN 0 1 2 FC Port 0 Robotics Drive 1 Drive 2 FC Port 1 Drive 3 Drive 4 - 2. The tape devices attached to the FC interface controller are sorted in ascending order by logical position in the library. 3. The first two tape devices are assigned to the first FC port at the next available LUNs. Table 4. Load balancing with 2 drives on a 2 FC Port FC interface controller LUN 0 1 FC Port 0 Drive 1 Drive 2 FC Port 1 - NOTE: The drives are both assigned to FC Port 0 so that if drives 3 and 4 are added later, the maps will be contiguous. 4. Then next two tape devices are assigned to the second FC port at the next available LUNs. Table 5. Load Balancing with 3 Tape Drives on a 2 FC port FC interface controller LUN 0 1 FC Port 0 Drive 1 Drive 2 FC Port 1 Drive 3 - Table 6. Load Balancing with 4 Tape Drives on a 2 FC Port FC interface controller LUN 0 1 FC Port 0 Drive 1 Drive 2 FC Port 1 Drive 3 Drive 4 5. If there are remaining tape devices, then the next two tape devices are assigned to the first FC port, the next two to the second FC port. This is repeated until all tape devices are assigned. 8 Table 7. Load Balancing with Robotics and 8 Tape Drives on a 2 FC port FC interface controller LUN 0 1 2 3 4 FC Port 0 Robotics Drive 1 Drive 2 Drive 5 Drive 6 FC Port 1 Drive 3 Drive 4 Drive 7 Drive 8 - The above algorithms are applied to all FC interface controllers in the library. 5. Maintain FC Port/LUN Map after cabling change on same Interface Controller. If a device's cable is moved from one port to another on the same FC interface controller, Secure Manager will attempt to maintain the current FC Port/LUN mapping for the device. Because devices are mapped by logical position the Interface Manager can correct for devices that have been cabled to different ports on the FC interface controller at power up and FC interface controller reboot. This remapping is not available if the tape device has been moved to a different FC interface controller. The purpose of this feature is to maintain a consistent view of the devices for the hosts connected to the library. 6. Advanced Secure Manager map creation is done like Basic Secure Manager but then removes devices and gaps if necessary Advanced Secure Manager mapping starts the same way as Basic Secure Manager LUN mapping. [. . . ] The physical robotics is connected to a different IC not represented in the table below. LUN 0 1 FC Port 0 FC Port 1 Physical Drive 3 (Partition 2, Drive 1) Physical Drive 4 (Partition 2, Drive 2) 13. The order each partition is mapped depends on the order that the HBA was added to partitions Because the mapping occurs when each HBA is added to a partition, the order that an HBA is added to partitions will govern the order in which each partition's devices show up in the maps for that HBA. For this reason, it is recommended that each HBA be added to partitions in order starting with partitions containing the lowest numbered physical drives and ending with the highest numbered physical drives. Example: An HBA is added to Partition 1 and then Partition 2. [. . . ]